Drusen treatment method and method for controlling drusen treatment device

1. A drusen treatment method, comprising:

identifying a position of drusen located in a patient's fundus;

determining a treatment area considering the position where the drusen are located; and

decreasing the drusen by transferring energy to the treatment area,

wherein determining the treatment area includes setting a boundary of the treatment area outside of an outer boundary of the drusen, a plurality of retinal pigment epithelium (RPE) cells being disposed between the outer boundary of the drusen and the boundary of the treatment area, a number of the plurality of RPE cells being in a range from two to fifteen, the outer boundary of the drusen and the boundary of the treatment area being on a surface that is perpendicular to a thickness of an RPE layer,

wherein transferring energy to the treatment area includes sequentially radiating light on a plurality of spots located within the treatment area, and

wherein transferring the energy to the treatment area includes transferring the energy to the entire treatment area that includes the plurality of RPE cells outside of the outer boundary of the drusen.

2. The drusen treatment method of claim 1 , wherein the energy transferred to the treatment area improves functions by which fundus tissues in the treatment area discharge the drusen to a choroid.

3. The drusen treatment method of claim 1 , wherein the energy transferred to the treatment area improves a function by which an RPE cell adjacent to the drusen discharges a waste between the RPE cell adjacent to the drusen and a Bruch's membrane to a space external to the Bruch's membrane.

4. The drusen treatment method of claim 1 , wherein an amount of the radiated light absorbed by an RPE cell in the treatment area is larger than an amount of the radiated light absorbed by a photoreceptor in the treatment area.

5. The drusen treatment method of claim 4 , wherein the amount of the radiated light absorbed by a choroid in the treatment area is smaller than the amount of the radiated light absorbed by the RPE cell in the treatment area, and larger than the amount of the radiated light absorbed by the photoreceptor.

6. The drusen treatment method of claim 4 , wherein the radiated light has a wavelength of 510 nm to 590 nm.

7. The drusen treatment method of claim 1 , wherein the radiated light selectively increases a temperature of an RPE cell in the treatment area.

8. The drusen treatment method of claim 7 , wherein a temperature of the RPE cell in the treatment area is increased by light radiated to the treatment area, and a temperature of a photoreceptor in the treatment area is not substantially increased by the light radiated to the treatment area.

9. The drusen treatment method of claim 8 , wherein a temperature rise of a choroid in the treatment area by the radiated light is smaller than a temperature rise of the RPE cell in the treatment area, and is larger than a temperature rise of a photoreceptor in the treatment area when the energy is transferred to the treatment area.

10. The drusen treatment method of claim 7 , wherein the radiated light is pulse-type laser, and the laser has a pulse width of 5 microseconds or less.

11. The drusen treatment method of claim 1 , wherein the plurality of RPE cells are a first plurality of RPE cells, and wherein transferring the energy to the treatment area causes thermal damage to a second plurality of RPE cells located in the treatment area, the thermal damage inducing regeneration of the second plurality of RPE cells in the treatment area.

12. The drusen treatment method of claim 11 , further comprising:

terminating the energy transfer based on a condition of the treatment area.

13. The drusen treatment method of claim 12 , wherein the condition is a thermal variation in the second plurality of RPE cells.

14. A method for controlling a drusen treatment device, the method comprising:

determining a treatment area based on a position of drusen present in a fundus;

transferring energy to a first spot within the treatment area;

terminating the energy transfer to the first spot based on a sensed condition of the treatment area; and

transferring energy to a second spot within the treatment area,

wherein determining the treatment area includes setting a boundary of the treatment area outside of an outer boundary of the drusen, a plurality of retinal pigment epithelium (RPE) cells being disposed between the outer boundary of the drusen and the boundary of the treatment area, a number of the plurality of RPE cells being in a range from two to fifteen, the outer boundary of the drusen and the boundary of the treatment area being on a surface that is perpendicular to a thickness of an RPE layer, and

wherein energy is transferred to the entire treatment area that includes the plurality of RPE cells outside of the outer boundary of the drusen.

15. The method of claim 14 , wherein the energy transferred to the treatment area improves a function by which an RPE cell adjacent to the drusen discharges a waste between the RPE cell adjacent to the drusen and a Bruch's membrane to a space external to the Bruch's membrane.

16. The method of claim 15 , wherein the sensed condition of the treatment area is a thermal variation in the RPE cell adjacent to the drusen.

17. A method, comprising:

identifying, by a drusen treatment device, a position of drusen located in a fundus;

determining, by the drusen treatment device, a treatment area considering the position of the drusen, an outer boundary of the treatment area being defined outside of an outer boundary of the drusen, a plurality of retinal pigment epithelium (RPE) cells being disposed between the outer boundary of drusen and the boundary of the treatment area, a number of the plurality of RPE cells being in a range from two to fifteen, the outer boundary of the drusen and the boundary of the treatment area being on a surface that is perpendicular to a thickness of an RPE layer; and

transferring, by the drusen treatment device, energy to the treatment area by sequentially radiating light on a plurality of spots within the treatment area,

wherein transferring the energy to the treatment area includes transferring the energy to the entire treatment area that includes the plurality of RPE cells outside of the outer boundary of the drusen.

18. The drusen treatment method of claim 1 , wherein decreasing the drusen by transferring energy to the treatment area includes decreasing the drusen by transferring energy to the treatment area without transferring energy outside of the treatment area.

19. The drusen treatment method of claim 1 , wherein the treatment area includes a plurality of photoreceptors and a second plurality of RPE cells, and

wherein sequentially radiating the light on the plurality of spots located within the treatment area includes causing thermal damage to the second plurality of RPE cells in the treatment area without causing thermal damage to the plurality of photoreceptors in the treatment area, the light having a wavelength of 510 nm to 590 nm.